diff --git a/libs/ui/include/psemek/ui/element.hpp b/libs/ui/include/psemek/ui/element.hpp
index 5b0fff88..68cb6104 100644
--- a/libs/ui/include/psemek/ui/element.hpp
+++ b/libs/ui/include/psemek/ui/element.hpp
@@ -8,6 +8,7 @@
 #include <psemek/async/event_loop.hpp>
 
 #include <psemek/util/span.hpp>
+#include <psemek/util/function.hpp>
 
 #include <memory>
 
@@ -53,7 +54,7 @@ namespace psemek::ui
 
 		virtual ~element() {}
 
-		virtual void post(std::function<void()> f);
+		virtual void post(util::function<void()> f);
 		virtual void post_reshape();
 
 	protected:
diff --git a/libs/ui/source/element.cpp b/libs/ui/source/element.cpp
index 49e5c3ef..882cec9a 100644
--- a/libs/ui/source/element.cpp
+++ b/libs/ui/source/element.cpp
@@ -79,7 +79,7 @@ namespace psemek::ui
 		return merged_style_;
 	}
 
-	void element::post(std::function<void()> f)
+	void element::post(util::function<void()> f)
 	{
 		auto l = loop();
 		if (l)